Yes, even despite [article id="1606852"]Phoenix's rather thuggish behavior[/article] at a Miami concert on Thursday — when he leapt into the crowd and wailed on a heckler — Paltrow, who stars with Phoenix in the film [article id="1605096"]"Two Lovers,"[/article] isn't convinced that he's given up his acting career to focus on rapping.

"I'm not a hundred percent sure that that's really going to be the case," she told MTV UK during a promotional junket for the film. "I think that there might be some other explanation or something going on. I'm not quite sure what, but I can't believe that he's really going to quit forever to become a rapper. It seems odd."

And that puts Paltrow squarely in the ever-growing camp of people who suspect that Phoenix's hip-hop career is actually just an [article id="1603675"]elaborate hoax[/article], despite [article id="1603702"]his publicist's assertions to the contrary[/article]. But even if she has her doubts, that doesn't mean Paltrow's not paying attention to Phoenix's every move. And she might even be taking a few notes.

"I'd like to take this opportunity to announce that I'm quitting acting to become a rapper," she laughed. "So, I'm going to write 'good-bye' across my knuckles and everything. Do you have a pen?"

While our colleague didn't have a pen handy, he did manage to ask Paltrow — who has sung both onscreen and onstage, and who, along with husband Chris Martin of Coldplay, is close friends with rapper Jay-Z — if she had any advice for Phoenix on his burgeoning hip-hop career. Turns out she did, and it's actually pretty sound: Start building street cred.

"What advice would I give to Joaquin?" she laughed. "Hmm ... maybe to go live in the projects for a few years to get some authenticity, maybe."